User Phira - Mathematics Stack Exchange

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visits	member for	2 years, 1 month
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	12,169 reputation	bio	website		visits	member for	2 years, 1 month
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$n \mid (a^{n}-b^{n}) \ \Longrightarrow$ $n \mid \frac{a^{n}-b^{n}}{a-b}$

number-theory modular-arithmetic

may 18 at 15:22 Community♦ 1

82

131

votes

9

answers

8

kviews

What's an intuitive way to think about the determinant?

may 13 at 7:14 MJD 21k

6

34

votes

0

answers

667

views

How to think of the group ring as a Hopf algebra?

finite-groups representation-theory intuition hopf-algebras group-ring

may 1 at 10:08 Alexander Gruber♦ 15.2k

45

52

votes

21

answers

3

kviews

List of Interesting Math Blogs

soft-question big-list online-resources

apr 25 at 3:25 Bean 849

1

6

votes

1

answer

274

views

Four turtles/bugs puzzle

geometry puzzle

apr 23 at 0:58 Community♦ 1

2

5

votes

1

answer

52

views

An infinite fraction

sequences-and-series contest-math

apr 21 at 20:00 Peter Tamaroff 25.9k

3

5

votes

4

answers

574

views

Why does the ideal $(a+bi)$ have index $a^2+b^2$ in $\mathbb{Z}[i]$?

abstract-algebra modules

apr 21 at 16:32 YACP 9,165

20

48

votes

2

answers

4

kviews

More than 99% of groups of order less than 2000 are of order 1024?

abstract-algebra combinatorics group-theory finite-groups p-groups

apr 15 at 20:46 Alexander Gruber♦ 15.2k

40

67

votes

5

answers

3

kviews

In (relatively) simple words: What is an inverse limit?

category-theory intuition universal-algebra

mar 29 at 8:55 Pieter Cuijpers 31

39

131

votes

10

answers

29

kviews

Multiple-choice question about the probability of a random answer to itself being correct

homework probability

mar 25 at 20:45 Community♦ 1

30

70

votes

3

answers

3

kviews

What is the smallest number of $45^\circ-60^\circ-75^\circ$ triangles that a square can be divided into?

geometry puzzle recreational-mathematics open-problem tiling

mar 25 at 15:26 Ed Pegg 2,111

183

163

votes

23

answers

10

kviews

Proofs that every mathematician should know?

soft-question big-list

mar 25 at 0:36 Glen O 3,177

4

16

votes

7

answers

1

kviews

“How long 'til we get there?” Road trip puzzle

calculus differential-equations puzzle

mar 9 at 8:17 Sid 141

3

6

votes

2

answers

616

views

Penrose Tile generator

geometry math-software tiling

jan 25 at 15:51 Stefan Hansen 8,563

1

3

votes

1

answer

1

kviews

Putnam 2012 B3 - Tournament combinatorics

combinatorics problem-solving

jan 9 at 6:52 Stefan Hansen 8,563

4

3

votes

3

answers

275

views

Prove that CX and CY are perpendicular

geometry euclidean-geometry

dec 29 at 2:18 RicardoCruz 555

1

vote

6

answers

298

views

Solving indetermination in limit

calculus limit

dec 15 at 0:58 Bruno Garcia 57

1

2

votes

1

answer

83

views

A be a $3\times3$ real valued matrix such that $A^{3}=I$ but $A \neq I$ .Then trace(A)=?

homework linear-algebra

dec 11 at 9:58 P.. 8,905

1

vote

1

answer

174

views

Maximum area for fixed perimeter of a triangle

calculus geometry problem-solving

dec 8 at 17:56 lab bhattacharjee 28.9k

2

5

votes

1

answer

199

views

A cute geometry problem about angle trisectors.

geometry euclidean-geometry recreational-mathematics

dec 4 at 15:21 Phira 12.2k

2

3

votes

2

answers

400

views

Number Theory Practice Questions

elementary-number-theory discrete-mathematics

dec 3 at 16:44 Amzoti 14k

2

votes

2

answers

111

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Proof : $2^{n-1}\mid n!$ if and only if $n$ is a power of $2$.

elementary-number-theory proof-strategy proof-writing

nov 30 at 23:02 Community♦ 1

3

6

votes

2

answers

310

views

generators and relations of symmetric group

abstract-algebra

nov 29 at 21:44 Phira 12.2k

1

vote

1

answer

55

views

Sum of angles in a polygon - Alternative solution

geometry combinatorial-geometry

nov 29 at 20:35 Phira 12.2k

1

5

votes

2

answers

146

views

Is there a $SL(2,\mathbb{Z})$-action on $\mathbb{Z}$?

abstract-algebra group-theory

nov 29 at 15:36 Rhys 1,306

2

4

votes

1

answer

412

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Lucas Theorem but without prime numbers

number-theory

nov 29 at 3:45 csLittleye 1

1

3

votes

1

answer

108

views

Such a thing as a circular arithmetic progression?

sequences-and-series elementary-number-theory

nov 28 at 15:29 Phira 12.2k

1

5

votes

1

answer

216

views

Super Perfect numbers

elementary-number-theory prime-numbers

nov 27 at 14:32 Phira 12.2k

1

3

votes

1

answer

91

views

What is this pattern in the Euclidean algorithm?

number-theory elementary-number-theory

nov 27 at 14:25 Phira 12.2k

1

2

votes

1

answer

85

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Integral over triple product of spherical Bessel functions

analysis integration

nov 27 at 9:30 joriki 92.7k

Phira

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